[tor-relays] Re: Tor People @ WHY2025

[trinity pointard via tor-relays <tor-relays@xxxxxxxxxxxxxxxxxxxx>]

> How does this work for machines that use
> ClientPreferIPv6ORPort 1

Sadly ClientPreferIPv6ORPort is somewhat broken with IPv4 only clients
today. See https://gitlab.torproject.org/tpo/core/tor/-/issues/40913#note_2994762
for a concrete example of something that can easily fail badly for end
users (but there might be other cases, possibly without using
bridges).

trinity-1686a

On Tue, 12 Aug 2025 at 00:01, Marco Moock via tor-relays
<tor-relays@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> Am 11.08.2025 um 15:48:52 Uhr schrieb Alexander Hansen Færøy via
> tor-relays:
>
> > Alex mentioned that he and GK had a discussion earlier this year
> > about both a potential solution for having IPv6-only
> > Middlenodes (in a network where all guards and all exits are
> > dual-stack) and how one could do something similar to Happy Eyeballs
> > within the Tor ecosystem.
>
> How does this work for machines that use
> ClientPreferIPv6ORPort 1
>
> Could that be default in torrc without breaking anything?
>
> I have that set on my guard/middle relays and detected no issues.
>
> https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/41742
> Here someone mentions a case where issues might occur, but without any
> details.
>
> --
> Gruß
> Marco
>
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